import java.util.ArrayList;

/**
 * @author 阿良
 * @version 1.0
 * @date 2021/9/10 21:11
 */
public class test {
    public static void main(String[] args) {

    }


    public static void test(){
        ArrayList arrayList=new ArrayList<String>();

        Integer a=5;
        if (a == null) {

        }
        if (a != null) {

        }
        if (a != null) {

        }

        System.out.println("a = " + a);



    }
}
